diff --git a/README.md b/README.md
index 0035c64..ec52f17 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,12 @@
 
     to /boot/config.txt
 
+    3. reboot
+    4. check sound cards
+
+            arecord -l
+
+